一个会玩电脑、动手能力超强的男孩和母亲、爷爷住在一栋大房子里,圣诞节他要求圣诞老人到家服务,结果上门的是个杀人的疯子! 他利用各种玩具、工具和疯子在家中周旋……最后带爷爷逃脱。Thomas, a very intelligent and resourceful child, is left alone with his beloved and fragile granddad on Christmas Eve, when a psychopath dressed as Santa Claus breaks into their mansion and starts chasing them. Thomas will do whatever he can to save himself and his granddad.